Statically optimized hybrid roller bearings

Abstract

A bearing 1 for mounting a cylindrical guide section 61 of a longitudinally extending rail 6, the mounting of which is guided so as to be displaceable in the longitudinal direction, based on rollers and sliding elements, the bearing 1 comprises a housing with a through-hole extending therethrough in which a receiving channel for receiving the guide section 61 of the rail 6 is formed. The bearing 1 comprises two rollers, spaced apart from each other in the longitudinal direction, both rotatably mounted in the housing and both bounding a receiving channel in the transverse direction by their running surfaces. Between the rollers, the housing has a mounting channel extending through it along a mounting axis perpendicular to the longitudinal direction for receiving a mounting bolt in a manner of rotation about the mounting axis. A number of sliding elements are arranged in the through-hole and both bounding a receiving channel perpendicular to the longitudinal direction by one of their surfaces.

Description

Technical Field

[0001] The present invention relates to a bearing described in the first part of claim 1, a bearing assembly having the bearing, and use of the bearing.

Background Art

[0002] This common type of bearing is used for longitudinal sliding mounting of work equipment on rails, particularly for lubrication-free mounting. This common type of bearing is based on a hybrid principle in which the bearing configuration is based on both rollers and sliding elements. Such a bearing has a housing with a receiving channel that extends longitudinally through the housing. Furthermore, such a bearing has both at least one roller and at least one sliding element. The roller is rotatably mounted within the housing on a roller axle that extends perpendicular to the longitudinal direction. When the bearing is used as intended, the guide portion of the rail, configured in the form of a cylindrical body, is received in the receiving channel and abuts against the running surface of the roller, and at least one sliding element surrounds the guide portion over an angular range of more than 200°, particularly more than 220°. When used as intended, the work equipment is positioned on the bearing in the following manner: In this configuration, a roller transmits the main load to a guide section and rolls along the guide section when the bearing is displaced longitudinally relative to the guide section, while a sliding element is provided longitudinally offset from the roller, so that when a transverse load is applied to the bearing relative to the guide section of the rail, i.e., a load perpendicular to the main load direction and perpendicular to the longitudinal direction, the sliding element slides along the guide section that is pressed by the transverse load when the bearing is displaced longitudinally relative to the guide section. This general type of bearing is particularly suitable for working devices that are manually shifted longitudinally, for example, in camera technology, machine tool doors, or panels. This is because, on the one hand, the hybrid technology used allows such a bearing to transport large loads along the rail with very little friction, and on the other hand, any transverse forces generated when the working device and consequently the bearing are displaced, especially manually, are absorbed by the sliding element used, so that the working device attached to the bearing can be displaced along the rail without generating much noise and with little friction. The bearing relating to the general term of claim 1 is known from Patent Document 1. Further prior art is known from Patent Documents 2, 3, 4, and 5. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] U.S. Patent No. 4714354 [Patent Document 2] Japanese Patent Application Publication No. 5-149334 [Patent Document 3] U.S. Patent Application Publication No. 2015 / 176643 [Patent Document 4] U.S. Patent No. 5281029 [Patent Document 5] German Patent Application Publication No. 3224282

[0004] In this common type of bearing, the rollers and sliding elements used are arranged contiguously within the housing passage such that the sliding elements contact the guide portion with the smallest possible contact area when the bearing is loaded along the main load direction, i.e., when the load is perpendicular to the roller axle. However, such bearings are limited, on the one hand, by the materials of the housing and rollers, and on the other hand, by the materials of the roller axle, if a separate roller axle is provided attached to the housing and to which the rollers are rotatably mounted. If the load in the main load direction is excessive, considerable wear and especially increased friction will occur. Therefore, such bearings can only be used as intended up to the static load capacity based on the load in the main load direction and the dynamic load capacity based on the load in the main load direction, as specified by the manufacturer. The dynamic load capacity is specified as a function of the intended total mileage. When a working device is mounted to slide longitudinally by bearings that are loaded to a degree exceeding their static load capacity, it is necessary to provide multiple bearings arranged continuously along the longitudinal direction and connected parallel to the main load direction to share the load applied by the working device. However, this has proven problematic because such a large number of bearings require a complex installation to avoid unintended high friction and / or excessive wear of the bearings, especially their rollers, between the guide portion of the rail and the bearings. This is because the bearings must be oriented with the longitudinal axes of their passages aligned with each other with high precision. This is because each bearing clearly fixes the position of the guide portion perpendicular to the longitudinal direction, and any variation from each other in the alignment of the longitudinal axes of the various bearings results in overdefined positioning of the guide portion by the bearing assembly generated by the bearings, accompanied by corresponding friction loss or load. [Overview of the project]

[0005] The object of the present invention is to provide a bearing, bearing assembly and / or bearing use that at least partially eliminates at least one of the disadvantages of the above-described general type of bearing.

[0006] As one embodiment of achieving the problem inherent in the present invention, the present invention proposes a bearing having the features described in claim 1. The bearing according to the present invention is suitable for mounting a cylindrical guide portion of a rail having its cylindrical axis in the longitudinal direction, in a manner that guides it so as to be displaceable in the longitudinal direction. The bearing is based on a roller and a sliding element such that the bearing is mounted on both at least one roller and at least one sliding element. The bearing comprises a housing having a passage extending through the housing along a longitudinal axis that extends in the longitudinal direction. A receiving channel is formed in the passage for receiving the guide portion of the rail. When the bearing is used as intended, the guide portion is positioned in the receiving channel with its cylindrical axis aligned along the longitudinal axis of the passage. The receiving channel is at least partially closed, preferably without interruption perpendicular to the longitudinal direction, and in particular over an angular range of at least 200°, at least 220°, at least 240°, and at least 260°. This enclosure preferably extends over at least 50%, particularly at least 80%, of the length of the passage that extends along its longitudinal axis. The receiving channel is entirely located within its passage. The receiving channel is bounded in place within its longitudinally perpendicular range by, for example, the passage itself, and in some embodiments, is bounded longitudinally perpendicular by bearing elements located within the passage, i.e., at least extending within the passage, for example by sliding elements and rollers located within the passage. In the case where the guide portion is configured such that, due to a passage extending longitudinally through the housing, the cylindrical guide portion of the rail is located within a receiving channel located within the passage, and its longitudinal range is at least five times, particularly at least ten times, the longitudinal range of the housing, the guide portion is located within the receiving channel, while the bearing is displaceable longitudinally along the guide portion.

[0007] According to the proposed solution, the bearing has two longitudinally spaced rollers, each of which is mounted in the housing so as to be rotatable around a roller axle extending perpendicular to the longitudinal direction, and each of which defines a receiving channel by its transverse running surface extending perpendicular to the roller axle. Thus, each roller is mounted in the housing in such a manner that it is rotatable around its associated roller axle. This can be achieved, for example, by using a bearing configuration applied around each roller and, as a result, a bearing configuration for the running surface of the roller outside the receiving channel. Alternatively, preferably, this is achieved using a roller axle, which is rigidly connected to or integrated within the housing and extends through the center of the roller, and the roller is rotatably mounted on the roller axle such that the running surface of the roller surrounds the roller axle in the circumferential direction. Each roller extends at least partially into the passage by its running surface, i.e., its radial end, so as to define a receiving channel provided in the passage perpendicular to the longitudinal direction. When the bearing is used as intended, the cylindrical guide portion is located within the receiving channel and thereby opposes the running surface of the roller. Thus, each roller boundaries the receiving channel in a transverse direction that extends perpendicular to its respective roller axle and perpendicular to the longitudinal direction. Thus, the transverse direction is clearly assigned to each roller. Preferably, the same transverse direction is assigned to all rollers such that the roller axles extend parallel to each other. In some embodiments, the bearing may include more than two rollers, for example, a first pair of rollers at a first longitudinal position and a second pair of rollers at a second longitudinal position. The roller axles of each pair of rollers are inclined relative to each other by a predetermined angle with respect to the longitudinal direction such that, when used as intended, the roller axles abut against two circumferential portions of the guide portion that are offset relative to each other by a corresponding angle with respect to the longitudinal axis. In such embodiments, preferably, one roller axle of each pair of rollers is oriented parallel to one roller axle of the other pair of rollers of each roller. The roller axles of a pair of rollers preferably have an angle of less than 120°, and more particularly less than 90°, with respect to the longitudinal axis.Preferably, the bearing has only two longitudinal positions where each roller or pair of rollers is provided, and these longitudinal positions are spaced apart longitudinally as described above. The housing further includes mounting channels that extend longitudinally between the rollers or between the above positions of the rollers, and through the housing perpendicular to the longitudinal direction along the mounting axis. Thus, the mounting axis extends transversely perpendicular to the longitudinal direction. The mounting channels are suitable for receiving mounting pegs, preferably cylindrical mounting pegs, such that the mounting pegs are positioned within the mounting channels, extend through the housing along the mounting axis, and are rotatably received around the mounting axis but are fixed in their longitudinal positions by the mounting channels. Not to mention, instead of mounting pegs, mounting bushings may be positioned within the mounting channels, or mounting bushings may be positioned within mounting channels where mounting pegs are similarly positioned. In this case, the mounting bushings are received in correspondence with the mounting channels, extend through the housing along the mounting axis, and are rotatably mounted around the mounting axis but are fixed in their longitudinal positions by the mounting channels. A plurality of sliding elements are further arranged in the passage, spaced longitudinally apart and offset longitudinally from the roller, each of which boundaries the receiving channel perpendicular to the longitudinal direction by one of its faces. By providing a plurality of sliding elements that are longitudinally offset from the roller and boundary the receiving channel, when the guide portion is subjected to a force perpendicular to the longitudinal direction of the bearing and having a force component perpendicular to the transverse direction of the roller, the guide portion may come into contact with at least one of the sliding elements when the bearing is used as intended. This ensures that the housing still contacts the guide portion via at least one roller and at least one sliding element, thus guaranteeing a low-noise and low-friction longitudinally displaceable mounting of the guide portion in the receiving channel, which is generally advantageous according to the present invention.

[0008] The bearing according to the present invention has numerous advantageous effects. The combination of two longitudinally spaced rollers and a plurality of sliding elements that are longitudinally spaced and offset from the rollers ensures that the guide portion always contacts the bearing with the least possible friction, even when subjected to forces having components perpendicular to both the longitudinal and transverse directions, thus preventing excessive wear and enabling a long service life for the bearing. By providing two longitudinally spaced rollers, the two rollers can absorb the load in the direction of the main load of the work device attached to the bearing. Provided that each pair of rollers is provided at each longitudinal position, the direction of the main load is preferably parallel to the transverse direction of the longitudinally spaced rollers, or parallel to the transverse bisector of each pair of rollers. Thus, the bearing is also suitable for use with large loads, particularly static load capacities exceeding 400N, especially exceeding 700N, and dynamic load capacities exceeding 400N, especially exceeding 700N, for a total travel distance of 10km, with the load capacity adapted to the load along the main load direction. Further longitudinal definition between the rollers of a mounting channel in which mounting pegs and / or mounting bushings can be rotatably received means that the bearing is mounted to the structural member via such mounting pegs or such mounting bushings, and when a force having force components perpendicular to the main load direction and perpendicular to the longitudinal direction acts between the guide portion of the rail and the bearing, the guide portion will contact at least one roller and at least one sliding element, while the bearing rotates around the peg or bushing. This prevents the guide portion from becoming jammed within the bearing. This is particularly advantageous when using two bearings spaced longitudinally apart. This is because, even if the longitudinal axes of those passages are not perfectly aligned with each other, these bearings can still rotate relative to each other by rotating around their respective mounting pegs or mounting bushings, thereby preventing clogging of the guide portion for the bearings, even in such use.Accordingly, the present invention relates particularly to the use of two longitudinally spaced bearings as a bearing assembly, so that a primary load force of preferably at least 800 N, particularly at least 1000 N, and particularly at least 1500 N can be slidably conveyed along the rail in the longitudinal direction as intended. It is generally preferable that the running surfaces of the two longitudinally spaced rollers both extend parallel to the longitudinal axis of the passage and abut against the same straight line that borders the receiving channel in a direction perpendicular to the longitudinal direction. The sliding elements preferably extend their longitudinally perpendicular cross-sections in the form of segments of an arc of a circle, with the longitudinal axis of the passage extending through their centers. The segments of the arc of a circle are preferably continuously closed over an angular range of at least 200°, particularly at least 220°, particularly at least 240°, and particularly at least 260° with respect to the longitudinal axis.

[0009] Generally, a bearing preferably has a mounting bushing that is rotatably mounted within a mounting channel. The mounting bushing is preferably configured in a cylindrical form, with its cylindrical axis extending along the mounting axis. The mounting bushing is positioned within the mounting channel, preferably having a longitudinal clearance of less than 0.5 mm, particularly less than 0.2 mm. The mounting bushing preferably protrudes beyond the housing along the mounting axis on at least one side. This allows the mounting bushing to be fixed in place on a structural member at its end without consequently limiting the housing's ability to rotate relative to the mounting bushing.

[0010] The housing preferably has first and second housing components arranged side by side along the mounting axis and detachably fixed to each other. The two housing components together form a mounting channel and / or a passage. Providing two housing components that are detachably connected to each other simplifies the manufacture and installation of the bearing according to the present invention.

[0011] Particularly preferably, the mounting channel is equidistant in the longitudinal direction from both longitudinal positions of the rollers or the pair of rollers, which are offset from each other in the longitudinal direction. This has the additional advantage that, in the event of any loading of a force perpendicular to the longitudinal and transverse directions of the rollers, the bearing can rotate uniformly by rotation around a mounting bushing or mounting peg located within the mounting channel. The mounting shaft and roller axle are preferably both perpendicular to the longitudinal axis, with the mounting shaft equidistant in the longitudinal direction from both roller axles. Particularly preferably, the mounting channel is located on the same side of the receiving channel as the roller axle. Needless to say, the roller axle and mounting channel are located outside the receiving channel with respect to the direction perpendicular to the longitudinal direction, preferably on the same side of the receiving channel with respect to this direction. Preferably, at least one sliding element is located at each longitudinal end portion of the passage. The passage has two longitudinal end portions that are opposite each other in the longitudinal direction. Each longitudinal end portion extends from the absolute longitudinal end of the passage to which it relates by a maximum of 30%, particularly a maximum of 20%, particularly a maximum of 10% in the longitudinal range of the passage. Preferably, one of the sliding elements is located only within the respective longitudinal end section. The mounting channel or mounting shaft is preferably equidistant longitudinally from the two sliding elements located in the two longitudinal end portions of the passage. Each sliding element located in each longitudinal end portion is preferably located closer to the absolute longitudinal end of the housing associated with the sliding element than to the roller closest to the sliding element in the longitudinal direction. Each of the sliding elements located in the longitudinal end portions is preferably spaced the same distance longitudinally from the roller closest to the sliding element in the longitudinal direction.

[0012] Particularly preferably, the running surface of the roller has a concave contour facing the receiving channel. Due to the concave contour, the roller can, particularly advantageously, contact the guide portion and contribute to the further guiding action of the guide portion. Particularly preferably, the contour has a cross section composed of spherical segments perpendicular to the longitudinal direction. This is particularly advantageous when the guide portion is implemented in the form of a cylindrical body having a round or elliptical cross section.

[0013] In one embodiment, the mounting bushing has a radial projection on its outer surface, particularly in the form of a flange. The projection extends radially and therefore perpendicular to the mounting axis. The projection is located in the radial extension of a mounting channel bounded on both sides along the mounting axis inside the housing. The mounting channel is preferably configured as a cylindrical body having a radial extension. Due to the radial extension being bounded on both sides, the radial extension forms a restraint for the projection, fixing the position of the projection along the mounting axis. Thus, the configuration of the projection in the radial extension of the mounting channel fixes the position of the mounting bushing relative to the housing along the mounting axis. Particularly preferably, the radial extension of the mounting channel is formed by the transverse ends of two housing components facing each other along the mounting axis. Thus, the radial extension is formed together by the two housing components. The term transverse end thereby refers to the ends of housing components whose ends face each other along the mounting axis, and in particular, abut each other. Forming a radial extension using two housing components is particularly advantageous in terms of ease of bearing manufacture. Particularly preferably, a first sliding element, particularly a hollow cylindrical body, is provided within a mounting channel between the housing and the mounting bushing. The sliding member ensures low-friction rotation of the mounting bushing relative to the housing. The first sliding member preferably includes a first sliding member projection, thereby positioning the first sliding member in a first portion of the radial extension of the mounting channel to fix its position relative to the housing along the mounting axis. In the mounting channel, a second sliding member is preferably provided offset from the first sliding member along the mounting axis. The second sliding member preferably has a second sliding member projection, thereby positioning the second sliding member in a second portion of the radial extension of the mounting channel to fix its position relative to the housing along the mounting axis. The projection of the mounting bushing is preferably located along the mounting axis and has a first surface facing the projection of the first sliding member, and a second surface away from the first surface facing the projection of the second sliding member.The radial extension is preferably a radial extension that is continuous along the mounting axis, and the two sliding member protrusions and the mounting bushing protrusions are located on the radial extension. Thus, the mounting bushing preferably contacts the housing, exclusively via at least one sliding member and therefore not directly. Particularly preferably, the first sliding member is located in a first portion of the mounting channel formed exclusively by a first housing component. Particularly preferably, the second sliding member is located in a second portion of the mounting channel formed exclusively by a second housing component. The mounting channel preferably consists of two parts.

[0014] It is generally preferable that the sliding element surrounds the longitudinal axis of the passage with an encircling angle of at least 220°, particularly at least 240°, and particularly at least 260°. It is generally preferable that the passage completely surrounds the longitudinal axis perpendicular to the longitudinal direction over an angular range of at least 220°, particularly at least 240°, and particularly at least 260°. Particularly preferable, the passage has a longitudinally continuous opening in a plane oriented perpendicular to the longitudinal direction. The sliding element preferably has a longitudinally continuous opening aligned with the opening in the passage. The opening is provided in the passage, and in particular, the sliding member acts to allow the web to slide through the opening while the bearing is slightly displaced longitudinally on the guide portion of the rail, and the tubular guide portion of the rail is connected to the rail body of the rail via its web.

[0015] It is generally preferable that the sliding element has grooves extending in the longitudinal direction. This prevents increased friction due to dirt, thereby allowing the contact area between the sliding element and the guide portion to be advantageously kept small. It is generally preferable that the roller axle extends parallel to the mounting shaft. It is generally preferable that the sliding element is made from a tribological polymer. The sliding member is preferably made from a tribological polymer. Such a tribological polymer is a polymer optimized with respect to wear reduction and friction reduction. Such a tribological polymer conventionally has a base polymer, for example, thermoplastic polyethylene, polypropylene, polyacetal, polycarbonate, polyamide, polyvinyl chloride, polytetrafluoroethene, and, in the case of thermosetting, a phenolic resin. A fine solid lubricant, for example, molybdenum disulfide or graphite, and / or a filler, for example, plastic material or textile fibers or particles, are added to this base polymer. The housing is preferably made from metal or metal alloy, particularly by die casting. The housing and the resulting passage preferably extend longitudinally for at least 6 cm, and more preferably between 6 cm and 15 cm. The rollers preferably have a diameter of 10 mm to 30 mm, and more preferably between 15 mm and 25 mm. The rollers are preferably made from a plastic material. The roller axle is preferably produced as a separate pin element fixed within the housing, and more preferably made from metal or a metal alloy. The housing is generally preferably made from aluminum.

[0016] The present invention further relates to a bearing assembly having a bearing according to the present invention and a rail having a guide portion configured in the form of a cylindrical body. In the bearing assembly according to the present invention, the guide portion is arranged to be displaceable in the longitudinal direction within the passage of the bearing, in particular within the receiving channel of the bearing located within the passage, and in contact with both rollers perpendicular to the longitudinal direction. The guide portion is preferably separated from the sliding element by less than 1 mm, in particular less than 0.5 mm, in particular less than 0.2 mm perpendicular to the longitudinal direction. Particularly preferably, the rail has a rail body and a web connected to the rail body, the web being connected to the guide portion, and thus the guide portion being connected to the rail body. The web preferably extends longitudinally without interruption along the length of the rail. The guide portion is preferably configured in the form of a cylindrical body with a circular or elliptical cross-section, to which the web connecting the guide portion to the rail body is attached. The rail comprising the rail body, web and guide portion is preferably manufactured integrally, in particular from aluminum, in particular by extrusion. Particularly preferably, the bearing assembly comprises further bearings according to the present invention so as to have two bearings according to the present invention, in particular only two bearings according to the present invention. The bearings are arranged side by side in the longitudinal direction, preferably spaced apart in the longitudinal direction. The guide portion of the rail is located within the passages of the two bearings, particularly within the receiving channels, and each bearing is fastened to a structural member by mounting pegs and / or mounting bushings located within the respective mounting channels of the bearings. The structural member may be, for example, a machine component, such as a support frame of a machine, or a part of a building, such as a wall.

[0017] The present invention further relates to the use of a bearing according to the present invention, wherein mounting pegs and / or mounting bushings are guided by channels and fixed in place to the bearing housing, particularly in the longitudinal direction, the transverse direction parallel to the mounting axis, and / or in the direction perpendicular to the mounting axis and the longitudinal axis, and at the same time fixed so as to be rotatable around the mounting axis. This fixed in place prevents translation relative to the housing as a result, but does not hinder rotation. The mounting bushing is preferably located within the mounting channel, and mounting pegs fastened to the mounting bushing at both ends are inserted into the bushing. Thereafter, the mounting pegs and mounting bushing are connected to each other in a fixed and non-rotatable manner, while the housing is mounted so as to be rotatable around the mounting bushing. In the use according to the present invention, the guide portion of the rail, formed in the form of a cylindrical body, is inserted longitudinally into a receiving channel that contacts the rollers, causing the rollers to rotate around their roller axles. Particularly preferably, the bearing is then displaced relative to the rail along the longitudinal direction. A force is applied between the bearing and the rail, thereby rotating the bearing around the mounting peg and / or the mounting bushing, and the guide portion is pressed against at least one of the sliding elements, and when pressed against it, slides along the longitudinal direction, while simultaneously contacting at least one of the rollers, causing that one roller to rotate around its roller axle. The force preferably has a longitudinal force component and a force component perpendicular to the transverse direction of the roller.

[0018] The present invention will be described in more detail below based on exemplary embodiments with reference to three drawings. [Brief explanation of the drawing]

[0019] [Figure 1a] Various schematic diagrams of various embodiments of the bearing assembly according to the present invention are shown. [Figure 1b] Various schematic diagrams of various embodiments of the bearing assembly according to the present invention are shown. [Figure 1c] Various schematic diagrams of various embodiments of the bearing assembly according to the present invention are shown. [Figure 2a] Shows various schematic diagrams of various figures of the components of the bearing assembly according to the present invention shown in FIG. 1. [Figure 2b] Shows various schematic diagrams of various figures of the components of the bearing assembly according to the present invention shown in FIG. 1. [Figure 3] It is a schematic exploded view of the bearing of the bearing assembly according to the present invention shown in FIG. 1.

Embodiments for Carrying Out the Invention

[0020] Figure 1, consisting of Figures 1a, 1b, and 1c, shows various schematic diagrams of various embodiments of a bearing assembly according to the present invention. The bearing assembly comprises a bearing 1 and a rail 6. The bearing 1 comprises a first housing component 2 and a second housing component 3. The first and second housing components 2 and 3 together form the housing of the bearing 1. The housing has a passage that extends through the housing along a longitudinal axis X that extends in the longitudinal direction. A guide portion 61 of the rail 6, configured in a cylindrical form, is positioned in the passage and connected to the rail body 62 of the rail 6 via a web. The passage in which the guide portion 61 is received is evident from the longitudinal plan view in Figure 1b and the longitudinal cross-sectional view in Figure 1c. The passage encloses the longitudinal axis X without interruption perpendicular to the longitudinal direction over an angular range of approximately 260°. The passage has an opening in a surface perpendicular to the longitudinal direction, and this opening is continuous in the longitudinal direction, through which a web extends, and through the web a guide portion 61 is connected to the rail body 62. This opening corresponds to an angular range in which the passage does not enclose the longitudinal axis X. The housing components 2 and 3 further form a mounting channel that extends in a cylindrical manner along the mounting axis Y. A mounting bushing 4 is positioned in this mounting channel, and when positioned within the mounting channel, the mounting bushing 4 is fixed in place relative to the housing components 2 and 3 in the longitudinal direction, but is rotatable relative to the housing components 2 and 3 about the mounting axis Y. The mounting bushing 4 has a hollow cylindrical jacket component 42, and a circumferentially extending projection 41 configured as a flange is formed on its radially outer surface, which is generally advantageous according to the present invention. The mounting channel has radial extensions bounded on both sides along the mounting axis Y, where the projection 41 of the mounting bushing 4 is positioned such that the mounting bushing 4 is fixed in place relative to the housing components 2 and 3 along the mounting axis Y. Furthermore, a first sliding member 24 and a second sliding member 34 are provided, each having a sliding member projection, which engages with the radial extension of the mounting channel such that the sliding members 24 and 34 are also held in a fixed position relative to the housing components 2 and 3 with respect to the mounting axis Y.The radial extension of the mounting channel is a continuous radial extension along the mounting axis Y, and both the projection 41 of the mounting bushing 4 and the sliding member projections of the sliding members 24 and 34 are located in this radial extension. The two housing components 2 and 3 each form part of the mounting channel, and at their transverse ends facing each other along the mounting axis Y, they each form part of the radial extension of the mounting channel. The housing components 2 and 3 are arranged side by side along the mounting axis Y and are detachably fixed to each other by bolts 5 with their transverse ends facing each other. This structure of the bearing 1 makes it particularly easy to assemble and, in particular, maintain the bearing 1, for example, to replace the sliding members 24 and 34, or to replace the sliding element 7 located in the passage and in contact with both the guide portion 61 and the passage.

[0021] Figure 2, consisting of Figures 2a and 2b, schematically illustrates various components of the bearing assembly according to Figure 1. Figure 2a shows the bearing assembly according to Figure 1 without the second housing component 3. Figure 2b shows a cross-section of the BB perpendicular to the mounting axis Y of the module shown in Figure 2a. Furthermore, Figure 3 is an exploded view of a schematic representation of the bearing 1 of the bearing assembly according to Figure 1. The configuration and mode of operation of the bearing 1 become clear when viewed in conjunction with Figures 2a, 2b, and 3. The bearing 1 has two rollers 8, each rotatably mounted within the housing around a roller axle 9. The roller axles 9 of both rollers 8 extend parallel to the mounting axis Y and are received in blind holes in the two housing components 2 and 3. In the embodiment described, the roller axle 9 is configured as a separate pin element fixed within the housing. The two roller axles 9 and consequently the two rollers 8 are separated by one equal distance along the longitudinal axis X from the mounting channel and are located on two different surfaces of the mounting channel and consequently the mounting bushing 4 with respect to the longitudinal direction. At each longitudinal end portion of the passage, a sliding element 7 is provided that surrounds the longitudinal axis X at an encircling angle of approximately 260°. In the intended use shown in Figure 2b, the cylindrical guide portion 61 of the rail 6 contacts both the running surfaces of the two rollers 8 and the sliding element 7. This is generally advantageous according to the present invention. The sliding element 7 and the rollers 8 boundary a receiving channel formed in the passage, and the guide portion 61 is received in the receiving channel in a transverse direction perpendicular to the longitudinal axis X and the mounting axis Y. This transverse direction corresponds to the main load direction of the bearing 1 and is perpendicular to the roller axles 9 and the mounting axis Y, which are parallel to each other and perpendicular to the longitudinal axis X, and this is generally advantageous according to the present invention.

[0022] Looking at the drawings together, it becomes even clearer that the mounting bushing 4 contacts the housing parts 2 and 3 exclusively via the sliding members 24 and 34, and therefore not directly. This ensures that the mounting bushing 4 can rotate relative to the housing parts 2 and 3 with as little friction as possible. The provision of the sliding element 7 and the roller 8 further ensures a particularly load-bearing, low-friction mounting of the rail guide portion 61 in the bearing 1, which is displaceable along the longitudinal axis X. Each of the sliding members 24 and 34 and the sliding element 7 is here made from a tribological polymer. Figures 2b and 3 further show that the two housing parts 2 and 3 each form a roller cavity for each of the rollers 8, and that each roller 8 is received in its respective roller cavity. Each of the housing parts 2 and 3 forms the boundary of its respective roller cavity along the mounting axis Y such that the roller 8 is fixed in its respective roller cavity at its position relative to the housing with respect to the mounting axis Y. Particularly preferably, and as demonstrated in this exemplary embodiment, the rollers 8 are received in each roller cavity with more than 50%, preferably more than 70%, of the running surface of the rollers 8, and their running surfaces extend out of each roller cavity into the passage of the housing. Providing corresponding roller cavities is generally advantageous according to the present invention. [Explanation of Symbols]

[0023] 1 bearing 2. First housing component 3. Second housing component 4 Mounting bushing 5 volts 6 rails 7. Sliding elements 8 Laura 9 Roller axle 24 First sliding member 34 Second sliding member 41 Protrusion 61 Guide section 62 Rail body X Long axis Y mounting shaft

Claims

1. A bearing (1) configured to guide a cylindrical guide portion (61) of a rail (6) that extends in the longitudinal direction and has a cylindrical axis, so that it can be displaced in the longitudinal direction, The bearing (1) is A housing having a passage extending through the housing along a longitudinal axis (X) extending in the longitudinal direction, the passage having a receiving channel formed for receiving the guide portion (61) of the rail (6), Equipped with, i) The bearing (1) has two rollers (8) spaced apart in the longitudinal direction, Each of the rollers is mounted within the housing so as to be rotatable around a roller axle (9) that extends perpendicular to the longitudinal direction. Each of the rollers defines the receiving channel by its running surface in a transverse direction extending perpendicular to the roller axle (9), ii) The housing has a mounting channel between the rollers (8) in the longitudinal direction, which is configured to receive a mounting peg and / or mounting bushing rotatably around the mounting axis (Y) and extends through the housing perpendicular to the longitudinal direction along the mounting axis (Y), iii) Multiple sliding elements (7) are arranged in the passage, spaced apart from each other in the longitudinal direction and offset in the longitudinal direction from the roller (8), Each of the sliding elements boundaries the receiving channel perpendicular to the longitudinal direction by one side of the sliding element. Bearing (1).

2. The mounting channel has a mounting bushing (4) that is rotatably mounted within it. The bearing (1) according to claim 1.

3. The housing has a first housing component (2) and a second housing component (3) arranged side by side along the mounting shaft (Y) and detachably fixed to each other. The bearing (1) according to claim 1.

4. The mounting channel is spaced equidistant from the two rollers (8) in the longitudinal direction. The bearing (1) according to claim 1.

5. At least one of the sliding elements (7) is positioned at each longitudinal end of the passage and is positioned closer to the absolute longitudinal end of the housing associated with the sliding element than the roller (8) that is closest to the sliding element in the longitudinal direction. The bearing (1) according to claim 1.

6. The running surface of the roller (8) has a concave contour that faces the receiving channel. The bearing (1) according to claim 1.

7. The mounting bushing (4) has a radial projection (41) on its outer surface, The radial projection is positioned within the housing on the radial extension of the mounting channel, which is bounded on both sides along the mounting axis (Y), and fixes the position of the mounting bushing (4) relative to the housing along the mounting axis (Y). The bearing (1) according to claim 3.

8. A hollow cylindrical first sliding member (24) is provided between the housing and the mounting bushing (4) within the mounting channel. The first sliding member (24) has a first sliding member projection positioned in the first portion of the radial extension of the mounting channel in order to fix the position of the first sliding member (24) relative to the housing along the mounting axis (Y). The bearing (1) according to claim 7.

9. The first sliding member (24) is positioned in the first portion formed by the first housing component (2). The bearing (1) according to claim 8.

10. The sliding element (7) surrounds the longitudinal axis of the passage with an encircling angle of at least 220°. The bearing (1) according to claim 1.

11. The passage completely encloses the longitudinal axis (X) perpendicular to the longitudinal direction over an angular range of at least 220°, and has an opening continuous in the longitudinal direction on a surface oriented perpendicular to the longitudinal direction. The bearing (1) according to claim 1.

12. The sliding element (7) has a groove extending in the longitudinal direction, The bearing (1) according to claim 1.

13. The roller axle (9) extends parallel to the mounting shaft (Y), The bearing (1) according to claim 1.

14. The sliding element (7) is made from a tribological polymer having a base polymer and a solid lubricant added to the base polymer, and / or the housing is made from metal or a metal alloy. The bearing according to claim 1.

15. The mounting bushing (4) protrudes beyond the housing along the mounting shaft (Y) on at least one side. The bearing according to claim 2.

16. The mounting channel is located on the same side of the receiving channel as the roller axle (9). The bearing according to claim 1.

17. The running surface of the roller (8) has a cross-section perpendicular to the longitudinal direction, which is configured in the form of a spherical segment. The bearing according to claim 6.

18. The radial projection (41) is in the form of a flange. The radial extension of the mounting channel is formed by the transverse ends of the two housing components (2, 3) that face each other along the mounting axis (Y). The bearing according to claim 7.

19. Within the mounting channel, a second sliding member (34) is provided offset from the first sliding member (24) along the mounting axis (Y), The second sliding member has a second sliding member projection positioned in the second portion of the radial extension of the mounting channel in order to fix the position of the second sliding member (34) relative to the housing along the mounting axis (Y). The bearing according to claim 8.

20. The second sliding member (34) is positioned in the second portion formed by the second housing component (3). The bearing according to claim 19.

21. The bearing (1) described in claim 1, A rail having a guide portion (61) configured in the form of a cylindrical body, A bearing assembly equipped with, The guide portion (61) is positioned to be displaceable within the passage of the bearing (1) in the longitudinal direction, and is in contact with both rollers (8) perpendicular to the longitudinal direction and is separated from the sliding element (7) by less than 0.5 mm perpendicular to the longitudinal direction. Bearing assembly.

22. The further bearing (1) described in claim 1, The bearings (1) are arranged side by side in the longitudinal direction, the guide portion (61) is positioned within the passage of the bearing (1), and each of the bearings (1) is fastened to a structural member by mounting pegs and / or mounting bushings (4) positioned within the respective mounting channels of the bearing. The bearing assembly according to claim 21.

23. The use of the bearing (1) according to claim 1, Mounting pegs and / or mounting bushings (4) are guided through the mounting channel and fixed in place to the housing of the bearing (1) and rotatably fixed around the mounting shaft, and the guide portion (61) of the rail, which is formed in the form of a cylinder, is inserted along the longitudinal direction into the receiving channel that contacts the roller (8) and rotates the roller (8) around the roller axle (9). Use of bearing (1).

24. The bearing (1) is subsequently displaced relative to the rail along the longitudinal direction, and in the process a force is applied between the bearing (1) and the rail, and the force causes the bearing (1) to rotate around the mounting peg and / or the mounting bushing (4), and the guide portion (61) is pressed against at least one of the sliding elements (7), and when pressed against it slides along the longitudinal direction, while at the same time contacting at least one of the rollers (8), and the roller (8) rotates around its roller axle (9). Use of the bearing (1) according to claim 23.

Images